The most simple and most basic type of power supply filter is a single shunt capacitor
filter, as shown in Figure 3. We saw in the previous lab that the full-wave rectifier produces a
full-wave output waveform which is twice that of the frequency of the input supply
frequency. We can increase its average DC output level even higher by connecting a suitable
filter or smoothing capacitor across the output of the bridge circuit as shown in Figure 3